| ELECTRODE STYLE | SINGLE FLAT SHELL GROUND ELECTRODE (SEE ALSO STYLE 4) |
| BODY STYLE | UNSHIELDED,SOLID OR THREADED POST,GASKET SEAT |
| HEIGHT ABOVE MOUNTING SURFACE | 2.190 INCHES NOMINAL |
| PROPRIETARY CHARACTERISTICS | PACS |
| MEAN EFFECTIVE PRESSURE RATING | 170.0 POUNDS PER SQUARE INCH MINIMUM AND 175.0 POUNDS PER SQUARE INCH MAXIMUM |
| NONDEFINITIVE SPEC/STD DATA | 3 TYPE AND B CLASS |
| REACH LENGTH | 0.625 INCHES NOMINAL |
| SEAT MAJOR DIAMETER | 1.125 INCHES MAXIMUM |
| SPECIAL FEATURES | COMMERCIAL-INDUSTRIAL-TRANSPORT SERIES |
| WIDTH ACROSS FLATS | 0.938 INCHES NOMINAL |
| TEST DATA DOCUMENT | 81348-WS506 SPECIFICATION (INCLUDES ENGINEERING TYPE BULLETINS, BROCHURES,ETC., THAT REFLECT SPECIFICATION TYPE DATA IN SPECIFICATION FORMAT; EXCLUDES COMMERCIAL CATALOGS, INDUSTRY DIRECTORIES, AND SIMILAR TRADE PUBLICATIONS, REFLECTING GENERAL TYPE DATA ON CERTAIN ENVIRONMENTAL AND PERFORMANCE REQUIREMENTS AND TEST CONDITIONS THAT ARE SHOWN AS "TYPICAL", "AVERAGE", "NOMINAL", ETC.). |
| THREAD SIZE AND SERIES/TYPE DESIGNATOR AND LOCATION | 7/8-18 UNS BASE |
| USAGE DESIGN | ENGINE OTHER THAN AIRCRAFT |